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Doc shows the results of treating the dirty / cloudy pond water. Testing different treatments for over 2 months the results are clear as to what clears up dirty and cloudy pond water. Usually the cause is planktonic algae which is a single cell algae and causes the water to look cloudy.  Planktonic algae, a microscopic, free-floating algae that exist in the top few feet of a pond can sometimes give the pond a green or brown coloration and tends to have rapid growth (or blooms) in the warmer months. Planktonic algae are an essential part of the food chain for fish and other aquatic creatures, but too much causes cloudy pond water.